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[ms] [llvm-ml] Allow optional parenthesized arguments for macros #129905

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Merged
merged 2 commits into from
Mar 11, 2025
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[ms] [llvm-ml] Allow optional parenthesized arguments for macros #129905

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a5eb83d
[ms] [llvm-ml] Allow optional parenthesized arguments for macros
ericastor Mar 5, 2025
a9ee94b
Merge branch 'main' into macro-paren
ericastor Mar 11, 2025
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4 changes: 3 additions & 1 deletion llvm/lib/MC/MCParser/AsmLexer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -698,8 +698,10 @@ size_t AsmLexer::peekTokens(MutableArrayRef<AsmToken> Buf,

Buf[ReadCount] = Token;

if (Token.is(AsmToken::Eof))
if (Token.is(AsmToken::Eof)) {
ReadCount++;
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Is this change related to the rest, or is it a separate drive-by fix?

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... it's been a while since I wrote this, and I'm sorry to say I'm not sure. I have a vague memory that it was related in a surprising way.

break;
}
}

SetError(SavedErrLoc, SavedErr);
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11 changes: 5 additions & 6 deletions llvm/lib/MC/MCParser/MasmParser.cpp
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Expand Up @@ -1985,7 +1985,10 @@ bool MasmParser::parseStatement(ParseStatementInfo &Info,

// If macros are enabled, check to see if this is a macro instantiation.
if (const MCAsmMacro *M = getContext().lookupMacro(IDVal.lower())) {
return handleMacroEntry(M, IDLoc);
AsmToken::TokenKind ArgumentEndTok = parseOptionalToken(AsmToken::LParen)
? AsmToken::RParen
: AsmToken::EndOfStatement;
return handleMacroEntry(M, IDLoc, ArgumentEndTok);
}

// Otherwise, we have a normal instruction or directive.
Expand Down Expand Up @@ -2829,7 +2832,7 @@ bool MasmParser::handleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc,
}

MCAsmMacroArguments A;
if (parseMacroArguments(M, A, ArgumentEndTok))
if (parseMacroArguments(M, A, ArgumentEndTok) || parseToken(ArgumentEndTok))
return true;

// Macro instantiation is lexical, unfortunately. We construct a new buffer
Expand Down Expand Up @@ -2913,10 +2916,6 @@ bool MasmParser::handleMacroInvocation(const MCAsmMacro *M, SMLoc NameLoc) {
eatToEndOfStatement();
}

// Consume the right-parenthesis on the other side of the arguments.
if (parseRParen())
return true;

// Exit values may require lexing, unfortunately. We construct a new buffer to
// hold the exit value.
std::unique_ptr<MemoryBuffer> MacroValue =
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19 changes: 19 additions & 0 deletions llvm/test/tools/llvm-ml/macro.asm
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Expand Up @@ -100,6 +100,25 @@ substitution_test_uppercase PROC
ret
substitution_test_uppercase ENDP

substitution_test_with_parentheses PROC
; CHECK-LABEL: substitution_test_with_parentheses:

SubstitutionMacro(2, 8)
; CHECK: mov eax, 2
; CHECK-NEXT: mov eax, 2
; CHECK-NEXT: mov eax, 2
; CHECK-NEXT: mov eax, 2
; CHECK: mov eax, dword ptr [rip + xa1]
; CHECK-NEXT: mov eax, dword ptr [rip + x2]
; CHECK-NEXT: mov eax, dword ptr [rip + x2]
; CHECK: mov eax, 8
; CHECK-NEXT: mov eax, 8
; CHECK-NEXT: mov eax, 8
; CHECK-NEXT: mov eax, 8

ret
substitution_test_with_parentheses ENDP

AmbiguousSubstitutionMacro MACRO x, y
x&y BYTE 0
ENDM
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